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Karpen, Ulrich (2012) Migration and human rights - challenges and possibilities. Amicus Curiae, 2012 (89). pp. 19-24.

Karpen, Ulrich (2012) Transitional justice and the transition to democracy: looking at the past to gain a better perspective for the future. Amicus Curiae, 2012 (90). pp. 16-21.

Karpen, Ulrich (2007) Competition versus cooperation: German federalism in need of constitutional amendments. Amicus Curiae, 2007 (70). pp. 13-16.